Toothbrush



FIG. 1 is a top, right, perspective view of a toothbrush showing my new design;

FIG. 2 is a left side view, the right side view being a mirror image thereof;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view, thereof. 

The ornamental design for a toothbrush, as shown and described. 